I had a SpeedPAK parcel from KG Hobby (the equivalent of regular airmail, but supposedly only for Ebay use) picked up in Hong Kong on 29th May which arrived in London on 4th June. That's within the usual SpeedPAK estimate.
The problem isn't with the airmail now, but with the backlog of parcels arriving and waiting to go through customs - due to social distancing and reduced staff due to the virus.
Now it's a case of waiting until they reach the parcel to process it. Reading other peoples' experiences it could be up to a month.
I did have a small parcel from France which I'd ordered on 25th May, and was delivered to me 30th May. Since we're technically still in the EU at the moment maybe that sped the process up?